Astragalus mollissimus var. matthewsii |
Astragalus mollissimus var. coryi |
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Matthews woolly locoweed, woolly locoweed |
Cory's woolly locoweed, woolly locoweed |
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Habit | Plants acaulescent or subacaulescent. | Plants usually shortly caulescent, sometimes subacaulescent. |
Stems | to 1.5 cm, obscured by imbricate stipules. |
2–25 cm, hairs spirally twisted, to 1.6–2.8 mm. |
Leaves | (3–)5–12 cm; stipules (3–)4–8 mm; leaflets 11–23, blades obovate, 3–12 mm. |
(4–)6–20 cm; stipules (5–)7–15 mm; leaflets (11–)17–25(–29), blades usually obovate or oblong-oval, sometimes rhombic-obovate, 5–18 mm. |
Racemes | (5–)7–12-flowered; axis (0.5–)1–4.5 cm in fruit, not or scarcely surpassing foliage. |
densely 15–45-flowered; axis 3.5–9 cm in fruit. |
Peduncles | scapiform, (1.5–)2.5–8 cm. |
8–21 cm. |
Flowers | calyx 10–13 mm, tube 7–8.6 × 3.4–4.7 mm, lobes 2.4–5.2 mm; corolla pale purple; banner 18.5–22.5 mm; keel 14.2–18 mm. |
calyx 10.5–14 mm, tube 7–8.7 × 3–4 mm, lobes (3.3–)3.7–5.5 mm; corolla cream; banner (14.4–)15–20.3 mm; keel 12–17.4 mm. |
Legumes | gently or abruptly incurved distally, broadly ovoid, turgid, 12–18 × 7–13 mm, widest near obtuse or truncate base, densely villous-tomentose; beak bilocular. |
narrowly ovoid or oblong-ellipsoid, 10–17 × 4.5–7 mm, glabrous or sparsely hispidulous (distally); beak unilocular. |
Seeds | 24–31. |
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Astragalus mollissimus var. matthewsii |
Astragalus mollissimus var. coryi |
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Phenology | Flowering Apr–Jun. | Flowering Mar–May. |
Habitat | Open slopes and hilltops, in ponderosa pine forests, along canyons to juniper-pinyon belt, on light, sandy or gravelly, sedimentary, granitic, or volcanic soils. | Calcareous clay flats and depressions on rolling plains. |
Elevation | 1900–2600 m. (6200–8500 ft.) | 500–1000 m. (1600–3300 ft.) |
Distribution |
AZ; NM |
TX |
Discussion | Variety matthewsii is scattered and uncommon in Apache County in eastern Arizona and from Santa Fe to McKinley counties in the mountains of north-central and northwestern New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety coryi is locally abundant on the northwestern Edwards Plateau in Crockett, Howard, Irion, Martin, Reagan, Schleicher, Sterling, and Upton counties. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. matthewsii, A. bigelovii var. matthewsii | A. argillophilus |
Name authority | (S. Watson) Barneby: Mem. New York Bot. Gard. 13: 746. (1964) | Tidestrom: Proc. Biol. Soc. Wash. 50: 21. (1937) |
Web links |